Diplomats face an uphill battle to reconcile Russian and Ukrainian “red lines” as a renewed U.S.-led push to end the war gathers steam, with Ukrainian officials attending talks in the U.S. over the weekend and Washington officials expected in Moscow early this week .

U.S. President Donald Trump's peace plan became public last month , sparking alarm that it was too favorable to Moscow. It was revised following talks in Geneva between the U.S. and Ukraine a week ago.

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